On windows, mouse wheels can scroll by a fixed delta or scroll by page. Scroll by page requires special handling since the amount to scroll depends on the content. There is basic support for this, but it fails on content that is vertically scrollable but doesn't have a compositor scrollbar.
For now, these scrolls just go to the main thread. It'd be better to handle them on the compositor thread.

This issue has been available for more than 365 days, and should be re-evaluated. Please re-triage this issue.
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